monitor/schema: support using atlas hcl file in monitor action #1392

Job	Run time
migrate-down	12s
golangci-lint	22s
migrate-test	12s
monitoring	36s
schema-apply (lint-review)	19s
schema-plan	15s
schema-apply (on-the-fly, true)	8s
schema-plan-approve	0s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	16s
schema-push	10s
schema-test	21s
schema-apply (local-plan, file://20240910173744.plan.hcl)	21s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	9s
shim	20s
shim-e2e	6s
schema-apply (legacy, v0.27.0, true)	14s
unit-tests	1m 18s
	5m 19s

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